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First β-decay spectroscopy of In135 and new β-decay branches of In134

M. Piersa-Siłkowska et al. (IDS Collaboration)
Phys. Rev. C 104, 044328 – Published 26 October 2021

Abstract

The β decay of the neutron-rich In134 and In135 was investigated experimentally in order to provide new insights into the nuclear structure of the tin isotopes with magic proton number Z=50 above the N=82 shell. The β-delayed γ-ray spectroscopy measurement was performed at the ISOLDE facility at CERN, where indium isotopes were selectively laser-ionized and on-line mass separated. Three β-decay branches of In134 were established, two of which were observed for the first time. Population of neutron-unbound states decaying via γ rays was identified in the two daughter nuclei of In134, Sn134 and Sn133, at excitation energies exceeding the neutron separation energy by 1 MeV. The β-delayed one- and two-neutron emission branching ratios of In134 were determined and compared with theoretical calculations. The β-delayed one-neutron decay was observed to be dominant β-decay branch of In134 even though the Gamow-Teller resonance is located substantially above the two-neutron separation energy of Sn134. Transitions following the β decay of In135 are reported for the first time, including γ rays tentatively attributed to Sn135. In total, six new levels were identified in Sn134 on the basis of the βγγ coincidences observed in the In134 and In135β decays. A transition that might be a candidate for deexciting the missing neutron single-particle 13/2+ state in Sn133 was observed in both β decays and its assignment is discussed. Experimental level schemes of Sn134 and Sn135 are compared with shell-model predictions. Using the fast timing technique, half-lives of the 2+, 4+, and 6+ levels in Sn134 were determined. From the lifetime of the 4+ state measured for the first time, an unexpectedly large B(E2;4+2+) transition strength was deduced, which is not reproduced by the shell-model calculations.

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  • Received 20 July 2021
  • Accepted 28 September 2021

DOI:https://doi.org/10.1103/PhysRevC.104.044328

Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI.

Published by the American Physical Society

Physics Subject Headings (PhySH)

Nuclear Physics

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Vol. 104, Iss. 4 — October 2021

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